Scraping tool

ABSTRACT

A manually operated scraper tool includes a handle that seats a blade retaining component that freely and rotatably holds a substantially circular cutting blade thereto. An alternate attachment embodiment of the scraper tool includes a tool receiving body, rather than a handle, that may be received and driven by a power tool.

BACKGROUND OF THE INVENTION

This invention relates generally to a scraping tool and, more particularly, to a scraping tool that may be utilized, for example, to scrape cylinder heads and blocks of engines to remove gasket or contaminate material from a generally planar surface.

When repairing an automobile engine, it is often necessary to replace the gaskets and seals, which are used at the interface of the component parts of an engine to effect a seal between the parts. For example, when the cylinder head is removed for access to the pistons for repair or other purposes, it is usually necessary to scrape the old gasket from the cylinder head as well as the block surface so that a new gasket may be positioned thereon. Generally, the surfaces to be scraped are flat, planar surfaces.

Various types of scraping tools have been used in the past to scrape such materials. Known prior art tools typically comprise a rigid scraper blade fixedly attached to a rigid handle component. While such prior art devices are generally effective, the fixed blade configurations of known devices are susceptible to catching or “hanging up” during use. When such a rigid blade catches on either the gasket being removed or on the surface being cleaned, there is a risk that the surface being cleaned may be undesirably nicked, scratched or chipped. Such a damaged surface with scrapes or other imperfections may give rise to the undesirable situation where it is more difficult to achieve effective seals between components upon reassembly. There remains however a need for an improved gasket scraper tool.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a first embodiment of the scraping blade of the present invention;

FIG. 2 is a bottom view of a first embodiment of the scraping blade of the present invention;

FIG. 3 is a cross-sectional view of a first embodiment of the scraping blade of the present invention;

FIG. 4 is a partial cross-sectional view of a first embodiment of the scraping blade of the present invention;

FIG. 5 is a perspective view showing a user removing a section of gasket material with a first embodiment of the scraping blade of the present invention;

FIG. 6 is a perspective view of a second embodiment of the scraping blade of the present invention;

FIG. 7 is a bottom view of a second embodiment of the scraping blade of the present invention;

FIG. 8 is a cross-sectional view of a second embodiment of the scraping blade of the present invention; and

FIG. 9 is a perspective view showing a user removing a section of gasket material with a second embodiment of the scraping blade of the present invention.

SUMMARY OF THE INVENTION

Briefly, the present invention comprises a scraper tool 10 that includes a handle 12 that seats a blade retaining component 20, such as a flat head screw, that freely and rotatably holds a substantially circular cutting blade 16. The blade 16 is especially useful for removing gasket material or other contaminants from a work surface. The blade 16 may catch when an impediment is encountered so as to rotate about the impediment and thus minimize damage or gouging of the surface being cleaned.

DETAILED DESCRIPTION OF THE INVENTION

With reference to the Figures and as best shown in FIGS. 1, 2, and 3, the scraping tool 10 of the present invention generally includes a handle 12, a blade retaining component 20, and a rotatable blade 16. As will be described in greater detail, the blade retaining component is adapted to rotatably retain the blade 16 on the handle 12.

As shown in FIGS. 1-5, the handle 12 is preferably attached substantially perpendicularly to and substantially at the center of the blade 16. As shown in the figures, the handle 12 may include an ergonomically shaped gripping portion. The handle 12 may be comprised of wood, plastic, metal, and combinations of these or any other suitable conventional materials known in the art.

The scraping tool 10 may include a reinforcing handle cover 14 that adds additional strength and rigidity to the scraping tool 10. As shown in FIGS. 1 and 3, the optional reinforcing cover may cover a length of the handle 12 and may be comprised of any suitable strong and durable material. Preferably, the reinforcing cover portion 14 is metallic.

As best shown in FIGS. 2-4, the blade 16 is preferably substantially circular and rotatably held on the handle 12 by the blade retaining component 20. Preferably the blade retaining component comprises a threaded head screw that is retained substantially coaxially in the handle 12. As best shown in FIG. 2, the blade retaining component may include an opening 22 adapted to receive an allen wrench for tightening the head screw 20 in the handle 12. Alternatively, the blade retaining component 20 may comprise a standard slotted or phillips head screw or any other suitable attachment device known in the art. The retaining component 20 preferably comprises any sufficient fastening device capable of being seated within the countersunk portion of the underside of the blade. It should be appreciated that the retaining component 20 depicted in the accompanying figures is only exemplary and it is within the scope of the invention to include other known fastening devices adaptable to fixedly or rotatably retain the blade 16 on the handle 12. As mentioned previously, and as shown in FIGS. 2 and 4, the contact surface of the blade is preferably countersunk so as to accommodate the head of the blade retaining component 20 so that preferably only the blade 16 (and not the retaining component 20) contacts the surface being cleaned during usage of the scraping tool 10.

With reference to FIG. 5, the scraping tool 10 of the present invention is especially adapted and useful for removing gasket material or for removing contaminants or other materials cleanly from a relatively planar work surface. The scraping blade of the present invention advantageously yields a clean surface without the excessive nicks and cuts experienced with the use of prior art scraping blades. The blade 16 may be reground or easily replaced when worn. As described previously, when the blade 16 of the present invention catches or “hangs up” on an obstruction, the blade 16 of the scraping tool 10 is free to rotate about the imperfection instead of digging into the imperfection or work surface. Accordingly, a surface cleaned with the scraping tool 10 of the present invention exhibits fewer scratches and imperfections which could result in seal failure or leakage which have often been attributable to the use of prior art scraping blades.

FIGS. 6-9 depict an alternate embodiment of the scraping blade tool 100 of the present invention. The embodiment 100 shown in FIGS. 6-9 lacks the handle 12 of the previously described embodiment, but instead includes a tool receiving body 112 adapted to be received in a socket and driven by a tool such as a powered screwdriver or air-ratchet (see FIG. 9). The body 112 may include an internal threaded portion 134 adapted to receive the blade retaining means 120. Ring 132 may be included to provide for a more effective seal between the attachment 100 and the tool 136.

As best shown in FIGS. 6-8, and just as with the previously described embodiment, the blade 116 is preferably substantially circular and rotatably held on the tool receiving body 112 by the blade retaining component 120. Preferably the blade retaining component comprises a threaded head screw that is retained substantially coaxially in the tool receiving body 112. As best shown in FIG. 7, the blade retaining component 120 may include an opening 222 adapted to receive an allen wrench for tightening the head screw 120 in the tool receiving body 112. Alternatively, the blade retaining component 120 may comprise a standard slotted or phillips head screw or any other suitable attachment device known in the art. The retaining component 120 preferably comprises any sufficient fastening device capable of being seated within the countersunk portion of the underside of the blade. It should be appreciated that the retaining component 120 depicted in the accompanying figures is only exemplary and it is within the scope of the invention to include other known fastening devices adaptable to fixedly or rotatably retain the blade 116 on the tool receiving body 112. As mentioned previously, and as shown in FIG. 8, the contact surface of the blade is preferably countersunk so as to accommodate the head of the blade retaining component 120 so that preferably only the blade 116 (and not the retaining component 120) contacts the surface being cleaned during usage of the scraping tool attachment 100.

With reference to FIG. 9, the scraping tool attachment 100 of the present invention is especially adapted and useful for removing gasket material in conjunction with a power tool such as a power screwdriver or air-ratchet. Similar to the first described embodiment, the scraping tool attachment 100 may be used for removing contaminants or other materials cleanly from a relatively planar work surface. The scraping tool attachment 100 of the present invention also advantageously yields a clean surface without the excessive nicks and cuts experienced with the use of prior art scraping blades. The blade 116 may be reground or easily replaced when worn. As described previously, when the blade 116 of the present invention catches or “hangs up” on an obstruction, the tool attachment may continue to rotate in the tool but the blade 116 of the scraping tool 10 is free to rotate about the imperfection instead of digging into the imperfection or work surface. Accordingly, a surface cleaned with the scraping tool attachment 100 of the present invention exhibits fewer scratches and imperfections which could result in seal failure or leakage which have often been attributable to the use of prior art scraping blade attachments.

The embodiments depicted and described in the present application are for exemplary purposes only and several variations are within the scope of the present invention. For example, the handle 12 may be attached in an offset fashion from the center of the blade 16. The handle 12 may also be disposed at an angle to the blade 16 to facilitate scraping blade use in hard to reach places. In addition, a blade component may be adapted to be used as an accessory with known manual tool handles having interchangeable attachments such as screw driver blades or chisel blades. Also, although it is preferred that the blade is rotatable about the point of connection with the handle, the blade also may be selectively fixably attached to the handle. 

1. A scraping tool comprising: (a) a handle, said handle having a gripping end and a blade-receiving end; (b) a blade retaining component, said blade retaining component having an elongated first end substantially disposed in said handle at said blade-receiving end of said handle, said blade retaining component having a second substantially rounded hub end having a chamfered peripheral edge; and (c) a rotatable blade comprising an outer circumferential cutting edge, said rotable blade further comprising an internal circular opening defined by a chamfered peripheral edge, said chamfered peripheral edge of said blade opening being slidably disposed atop said chamfered peripheral edge of said hub end of said blade retaining component in such a manner so as to facilitate the free rotational movement of said blade about said hub end of said blade retaining component.
 2. A scraping tool attachment for use with a power tool comprising: (a) a tool receiving body, said tool receiving body having a tool receiving end and a blade-receiving end; (b) a blade retaining component, said blade retaining component having an elongated first end substantially disposed in said tool receiving body at said blade-receiving end of said tool receiving body, said blade retaining component having a second substantially rounded hub end having a chamfered peripheral edge; and (c) a rotatable blade comprising an outer circumferential cutting edge, said rotatable blade further comprising an internal circular opening defined by a chamfered peripheral edge, said chamfered peripheral edge of said blade opening being slidably disposed atop said chamfered peripheral edge of said hub end of said blade retaining component in such a manner so as to facilitate the free rotational movement of said blade about said hub end of said blade retaining component. 